Most likely 2.0 "doesn't like" OpenCL 1.0 + GT120 combo or you're not running final version. Get it from http://www.luxrender.net/wiki/LuxMark or insanelymac. I've used it in 10.6.8 with ATI cards without problems (aside from wrong memory amount reporting).

Quote:

Originally Posted by some forum

BTW, it looks like the precompiled LuxMark 2.0 benchmark for OpenCL also requires at least OpenCL 1.1: it runs fine on Mac OS X 10.7.x and 10.8.x, but crashes the window manager on 10.6.x without warning;